French-German 10-year yield spread widens to 100 basis points for first time since eurozone debt crisis

The gap between what France and Germany pay to borrow money for a decade just hit a level not seen since the eurozone was genuinely wondering whether it would survive. The OAT-Bund spread, the difference between French and German 10-year government bond yields, has widened to 100 basis points, a threshold that carries serious psychological weight in European fixed income markets.

The numbers behind the nervousness

As of September 18, the spread stood at 97.9 basis points, with French 10-year yields climbing to approximately 4.48% while German Bund yields sat around 3.50%. French 10-year yields have pushed past 4.5% for the first time since 2008, a milestone that would have seemed improbable just a few years ago when yields across Europe were flirting with zero or even negative territory.

Back in April 2026, the spread hovered around 60 basis points. The historical peak of the OAT-Bund spread during the eurozone sovereign debt crisis hit approximately 190 basis points in late 2011. So the current level is roughly halfway between normal and full-blown crisis.

Why France is getting the cold shoulder

French public debt has surpassed 117% of GDP, a figure that puts it well above the eurozone’s own 60% reference threshold. The European Commission projects a fiscal deficit for France of about 5.1% of GDP for 2026, more than double the EU’s 3% deficit ceiling.

Political dynamics have compounded the problem. Premier Lecornu’s proposed government cutbacks have generated friction rather than confidence, arriving amid broader political tensions that make it unclear whether any meaningful fiscal reform can actually pass through the legislative process. Budget debates loom on the horizon.

What the spread really signals

The OAT-Bund spread functions as a real-time referendum on relative fiscal credibility between the eurozone’s two largest economies. When it widens, it tells you that the market is beginning to differentiate more aggressively between eurozone members, undermining the implicit assumption that membership in a common currency area means roughly equivalent credit risk.

French corporate borrowing costs tend to track the sovereign, meaning companies headquartered in France could face incrementally tighter financial conditions. Banks holding significant portfolios of French government bonds, a group that includes most major French financial institutions, also see their balance sheet optics shift as the spread widens.

Demand for French government bonds has not evaporated. Auctions continue to clear, and 100 basis points is a long way from the 190-basis-point levels that characterized genuine existential anxiety about the eurozone’s survival in 2011. Analysts have distinguished between elevated caution and outright panic, and the current spread sits firmly in the former category.